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            ( eval '( $string1 | $string2 )  =~ tr[$n1][$n1]' ),
            ( eval '( ~$string1 & $string2 ) =~ tr[$ndiff][$ndiff]' ),
            ( eval '( $string1 & ~$string2 ) =~ tr[$ndiff][$ndiff]' ),
            ( eval '( $string1 & $string2 )  =~ tr[$n2][$n2]' ) ),